FIELD: oil and gas industry.
SUBSTANCE: group of inventions relates to the oil and gas industry, in particular to adjustment of bottom pressure. For implementation of a method for control of pressure of well fluid in a wellbore, during a drilling operation with controllable pressure, injection of a drilling mud into the specified well is stopped. Compressible fluid is injected into an upper part of the specified well, downstream from a fitting located on a collector of a system for drilling with controllable pressure. A volume of injected compressible fluid is monitored for control of pressure in the specified well. Compressible gas is injected between the collector and the wellbore. A method for buffering pressure of well fluid in a wellbore during a drilling operation with controllable pressure is claimed. The system for use in drilling of oil or gas wells contains a device for injecting drilling mud, made with the possibility of maintenance of control of fluid pressure in the wellbore during operation of a drill string in it. A compression system is connected via fluid to a gas reservoir and a well. A pressure adjustment system is functionally connected to the gas reservoir and the well and is made with the possibility of measurement of pressure in an annular space. The system is made with the possibility of injection of gas into an upper part of the wellbore for maintenance of pressure in the well in the annular space of the wellbore, when stopping the drilling operation for addition of a new plug to the drill string and stopping a device for injection of the drilling mud. A system for use in drilling of oil or gas wells is claimed, made with the possibility of purification of lines, when a drilling installation operates with a drill string.
EFFECT: absorption of pressure impacts, prevention of emissions and formation of cracks in reservoirs.
10 cl, 4 dwg
